The UK's most complete GLP-1 guide
Every Question Answered. Every Side Effect Explained.
- How GLP-1 medications work
- Mounjaro vs Wegovy compared
- Injection instructions
- Side effects & solutions
- What to eat on treatment
- FAQs answered
Free tracker included with every download this week
Does Sleeping Help Weight Loss?
Yes, getting enough quality sleep can genuinely support weight loss efforts. Sleep plays a crucial role in regulating hunger hormones, metabolism, and energy balance. When you're well-rested, your body is better able to manage appetite and maintain healthy eating patterns. The NHS emphasises that good sleep is an essential part of overall weight management alongside diet and physical activity. Understanding how sleep affects your weight can help you make informed decisions about your health.
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Calculate Your BMI Instantly
Enter your height and weight below. Supports both imperial (stone & lbs) and metric (kg). Results include NHS category, healthy weight range, and ethnicity adjustments.
What Is BMI and Why Does It Matter?
Body Mass Index (BMI) is the most widely used screening tool for assessing whether your weight falls within a healthy range. Used by the NHS, GPs, and weight management services across the UK, BMI provides a quick snapshot of your weight relative to your height. The formula is simple: your weight in kilograms divided by your height in metres squared (kg/m²).
While BMI isn't a perfect measure — it doesn't account for muscle mass, bone density, or fat distribution — it remains the standard first step in identifying potential weight-related health risks including type 2 diabetes, cardiovascular disease, high blood pressure, and certain cancers.
The NHS also recommends adjusted thresholds for people of South Asian, Chinese, or Black African heritage — a BMI of 23 or above is classified as overweight, and 27.5 as obese. Our calculator includes this adjustment as a one-click toggle.
How Sleep Affects Weight Loss
Sleep influences weight management through several key mechanisms. During deep sleep, your body regulates two critical hormones: leptin (which signals fullness) and ghrelin (which triggers hunger). When you don't sleep enough, leptin drops and ghrelin rises, making you feel hungrier and more likely to overeat. Sleep deprivation also slows your metabolic rate — the speed at which your body burns calories at rest.
- Poor sleep reduces insulin sensitivity, increasing type 2 diabetes risk
- Sleep loss impairs glucose regulation and increases cravings for high-calorie foods
- Lack of rest increases cortisol (stress hormone), which may promote fat storage
- Well-rested people typically have more energy for physical activity
Research shows adults sleeping 6 hours or less per night have a higher BMI on average than those sleeping 7–9 hours. Use our free BMI calculator to check your current weight status, and consider sleep quality as part of your broader weight management strategy.
Clinically BackedWeight Loss
No appointments. No waiting rooms. Just care — from a UK-regulated online pharmacy.
How It Works
Three simple steps to understand your weight and take action.
Enter your height and weight in our free calculator. Get your BMI, NHS category, healthy weight range, and ethnicity-adjusted thresholds instantly.
If your BMI suggests you're overweight or obese, explore our GLP-1 calculators to project potential weight loss on Mounjaro or Wegovy.
Use our progress tracker to log your weight weekly, visualise your journey with charts, and stay motivated — all stored privately in your browser.
Free Weight Loss Tools & Guides
Everything you need to understand your weight, explore medication options, and track your progress — completely free.
Recommended Sleep and Weight Loss
The NHS recommends adults aim for 7–9 hours of quality sleep per night for optimal health, including healthy weight management. Consistent sleep patterns—going to bed and waking at the same time daily—help regulate your body's internal clock and hormone balance. Good sleep hygiene includes keeping your bedroom cool, dark, and quiet; avoiding screens 30–60 minutes before bed; and limiting caffeine after 2 PM.
If you're pursuing prescription weight loss through GLP-1 medication or making dietary changes for weight management, adequate sleep amplifies these efforts. Quality rest improves your ability to make healthy food choices, stick to exercise routines, and manage stress. Track your weight progress alongside lifestyle changes using our free progress tracker, and remember that sustainable weight loss combines multiple factors: sleep, nhs weight loss principles, balanced diet, activity, and when appropriate, prescription weight loss medication.
- Dual GIP/GLP-1 receptor agonist
- Up to 22.5% body weight loss (SURMOUNT-1)
- Weekly injection, dose escalation over 20+ weeks
- Available via private prescription in the UK
- Doses: 2.5mg → 5mg → 7.5mg → 10mg → 12.5mg → 15mg
- GLP-1 receptor agonist
- Up to 15–17% body weight loss (STEP trials)
- Weekly injection, 5-step dose escalation
- NHS & private prescription available
- Doses: 0.25mg → 0.5mg → 1mg → 1.7mg → 2.4mg
Mounjaro vs Wegovy: Head-to-Head
A side-by-side comparison of the two most popular GLP-1 weight loss medications available in the UK.
| Feature | Mounjaro | Wegovy |
|---|---|---|
| Drug class | Dual GIP/GLP-1 agonist | GLP-1 agonist |
| Active ingredient | Tirzepatide | Semaglutide |
| Avg. weight loss | 15–22.5% | 12–17% |
| Key trial | SURMOUNT-1 (2022) | STEP 1 (2021) |
| Max dose | 15 mg weekly | 2.4 mg weekly |
| Escalation period | 20–32 weeks | 16–20 weeks |
| Administration | Weekly injection (pen) | Weekly injection (pen) |
| NHS availability | Private prescription only | NHS & private |
| Approx. private cost | £150–£250/month | £150–£300/month |
| Common side effects | Nausea, diarrhoea, constipation | Nausea, vomiting, diarrhoea |
Data sourced from SURMOUNT-1 and STEP 1 clinical trials. Costs are approximate and vary by provider. Always consult a prescriber.
Am I Eligible for Weight Loss Medication?
In the UK, eligibility for GLP-1 weight loss medications like Mounjaro and Wegovy is based on your BMI and overall health profile.
- BMI of 30 or above (obese)
- Age 18 or over
- No contraindicated conditions
- Committed to lifestyle changes
- BMI of 27 or above
- Plus type 2 diabetes
- Or high blood pressure
- Or obstructive sleep apnoea
Use our BMI calculator to check whether your BMI falls within the eligible range.
How We Built These Tools
Every calculator and guide on myweightcheck is built with accuracy and transparency in mind. Our BMI calculator uses the standard WHO formula with NHS-aligned category thresholds. Our GLP-1 projections are modelled on published clinical trial data from SURMOUNT and STEP studies.
All data stays on your device. We don't require sign-ups, and we don't store your health information on any server. Your progress tracker saves data locally in your browser using localStorage, so only you can see it.
We're based in the UK and our tools are designed specifically for UK users — supporting stone & lbs by default, referencing NHS guidelines, using NICE-approved medication data, and linking to GPhC-registered pharmacies.
Frequently Asked Questions
Common questions about BMI, weight loss medications, and our free UK tools.
How many hours of sleep do I need for weight loss?
The NHS recommends 7–9 hours per night for most adults. Consistency matters as much as duration—going to bed at the same time daily helps regulate hunger hormones and metabolism, supporting effective weight management in the UK and beyond.
Can poor sleep prevent weight loss?
Yes. Sleep deprivation increases hunger hormones (ghrelin) and decreases fullness signals (leptin), making you more likely to overeat. It also slows metabolism and increases cravings for sugary, high-calorie foods, making weight loss significantly harder.
Does sleep quality matter as much as sleep quantity?
Absolutely. Deep, uninterrupted sleep is more restorative than light, fragmented sleep. Focus on both getting enough hours and improving sleep quality through good sleep hygiene—dark room, consistent bedtime, no screens before bed, and avoiding late caffeine.
How does sleep relate to weight loss injections like Wegovy or Mounjaro?
Sleep quality enhances the effectiveness of prescription weight loss medication. When well-rested, you're better able to follow dietary guidance, maintain physical activity, and manage appetite. Our GLP-1 weight loss calculator can help project results when combined with good sleep and lifestyle changes.
Can I lose weight by sleeping more without diet or exercise?
Sleep alone won't cause significant weight loss. However, good sleep supports the habits that do work—healthy eating and activity. The most effective weight loss approach combines adequate rest, balanced nutrition, physical activity, and when appropriate, prescription weight loss medication after GP assessment.
Ready to take control of your weight loss journey?
Start with a free BMI check, explore your GLP-1 options, or begin tracking your progress today. No sign-up. No cost. Just results.