Most people have a sleep cycle that’s around 90 minutes long, so sleeping for a multiple of this means that you wake up during the lightest part of the sleep cycle. Waking up from deep sleep is hard, and can leave you feeling sleepy for the rest of the day. Waking from light sleep is much easier, because your body is more awake.
If I had the choice between eight hours sleep or seven & a half hours, I’d go for seven & a half.
Imagine being on a seesaw and an adult is on the other side helping you go up and down. It’s easy to get out of the ride then you’re at the “down” part and difficult to get out when you’re at the “up” right?
In this example, the seesaw is sleep, and each “up” and “down” takes around 90 minutes. Getting woken up at the wrong timing is like being made to get out of the seesaw while you’re in the “up” part; it’s not a good time 🙁
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