Almost always, yes. If you are referring to intermittent fasting, then the 8 hour eating window starts at your 1st meal of the day. So if you wake up and eat br

Almost always, yes. If you are referring to intermittent fasting, then the 8 hour eating window starts at your 1st meal of the day. So if you wake up and eat breakfast, then 8 hours from that is when you stop, and then sleep. If, on the other hand, you have your 1st meal as dinner in the evening, then also, you have slept for 8 hours and spent another 8 hours - morning through afternoon fasting. So either way, 8 hours of sleep covers half the fasting. Which is why it's somewhat intimidating cos there's a chance you wake up feeling hungry and can't fall asleep... I do intermittent fasting on week days, but like someone else has mentioned it's kind of difficult to keep up with considering the 9 to 5 work schedule dictates our eating routines (for most people). I did notice an improvement in my digestion and in sleep quality. On days that I do work out, I sometimes wake up and have trouble falling asleep as I feel hungry... that's always annoying.