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 Sleep Help In Weight Loss?
Yes, sleep plays a significant role in weight loss and weight management. Poor sleep can increase hunger hormones, reduce your ability to feel full, and slow your metabolism. The NHS recognises that good sleep hygiene is an important part of sustainable weight management alongside diet and physical activity. If you're struggling to lose weight despite good sleep habits, prescription weight loss options may be worth discussing with your GP.
10,000+ calculations today · NHS-aligned thresholds · 100% free
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 And Metabolism
Sleep directly influences the hormones that control hunger and appetite. When you don't get enough sleep, your body produces more ghrelin (the hunger hormone) and less leptin (the fullness hormone), making you feel hungrier and less satisfied after eating. This can lead to consuming more calories than you need.
- Adults need 7–9 hours of quality sleep per night for optimal health and weight management
- Poor sleep increases cortisol (stress hormone), which can promote fat storage around the abdomen
- Sleep deprivation slows your metabolic rate, meaning your body burns fewer calories at rest
- Lack of sleep increases cravings for high-calorie, sugary foods
Combined with a reduced-calorie diet and increased physical activity, good sleep can significantly support weight loss efforts and help you achieve a healthy BMI.
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.
UK Weight Loss Support — When Sleep And Lifestyle Aren't Enough
If you're following healthy sleep routines and a balanced diet but still struggling to lose weight, prescription weight loss medication may be an option. In the UK, GLP-1 weight loss injections like Mounjaro and Wegovy are available for adults with a BMI of 30 or above, or 27 or above with weight-related health conditions. These medications work alongside lifestyle changes, not instead of them. Speak to your GP about whether you might be eligible for weight loss medication on the NHS, or explore private prescribing options. Use our free GLP-1 weight loss calculator to understand potential outcomes at different doses.
- 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. Consistently getting less than 6 hours can significantly impair weight loss efforts by disrupting hunger hormones and metabolism. Better sleep quality also improves your ability to stick to healthy eating habits.
Can poor sleep prevent weight loss even with exercise and diet?
Yes. Poor sleep can make weight loss much slower or harder, even if you're in a calorie deficit and exercising regularly. Sleep deprivation increases cortisol, reduces fat oxidation, and increases hunger signals. Prioritising sleep alongside diet and exercise gives you the best chance of success.
What if I have good sleep but still can't lose weight?
If sleep, diet, and exercise aren't producing the results you want, prescription weight loss medication may help. Mounjaro, Wegovy, and Saxenda are UK-licensed GLP-1 medications available through NHS specialist services or private prescribing. Check your BMI using our free BMI calculator, then speak to your GP about eligibility.
Does sleep help weight loss with medication like Mounjaro?
Yes. GLP-1 weight loss medications work best alongside good sleep habits, a balanced diet, and regular physical activity. Sleep supports the hormonal environment that helps these medications work effectively. Combining all lifestyle factors gives the best outcomes.
How can I improve my sleep for better weight management?
Keep a consistent sleep schedule, avoid screens 1 hour before bed, reduce caffeine after 2pm, and keep your bedroom cool and dark. If sleep problems persist, speak to your GP. Good sleep is a free and powerful tool for supporting weight loss alongside other healthy habits.
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.