Intermittent fasting and sleep: how they affect each other

Bad sleep sabotages your fast

Short sleep spikes ghrelin (the hunger hormone) and drops leptin (fullness). Translation: sleep badly and the next day you are hungrier with less willpower. Sleeping well is half the fasting battle already won.

Eating dinner early improves sleep

Going to bed mid-digestion makes for worse rest. That is why a 16/8 that closes the window early (dinner at 8 pm, fasting overnight) usually improves sleep quality. Your body rests better when it is not digesting.

If you fast late, be careful

Some people who skip dinner (eating 8 am to 4 pm) sleep worse because they go to bed very hungry. If that is you, shift the window so you can have a light dinner, or try skipping breakfast instead.

A routine that lines both up

• Close your window 2–3 hours before bed.
• No caffeine after mid-afternoon (it will not break your fast, but it will wreck your sleep).
• Hydrate through the day, not right before bed.

How Ayúname helps

Ayúname helps you pick a window that respects your sleep and reminds you to close it on time. Better sleep, better fasting, better results.