How To Sleep Longer During Shorter Nights
If your body naturally wakes you up early like mine, you might need to invest in some blackout blinds. “Our circadian rhythm, otherwise known as our internal body clocks, determines why we feel alert during the day and then sleepy at night,” Jones says.
Article source: https://www.huffingtonpost.co.uk/entry/how-to-sleep-longer-during-shorter-nights_uk_62c3e957e4b0f612572b26d3