I’ve learnt a little about sleep cycles and remember that every 90 minutes is when we move through the 5 stages of sleep, but I’ve also heard it’s recommended to have 8 hours of sleep. Wouldn’t that make you feel drowsy if you’re interrupting the sleep cycle when you wake up after 8 hours?
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1) How much sleep people need is varied, and the side effects of not getting enough also vary, so it’s hard to tell when someone is sleeping properly.
2) The idea of 8 (or 9 in some studies) of sleep isn’t about getting 8 hours of actual sleep, but accounting for you taking a while to fall asleep and give you enough time to wake up. I think the actually sleep is 6 hours with many studies – but people take time to fall asleep and then wake up in the middle of the night.
3) The undisputed ideal sleep situation is one where you wake up naturally – this ensures you are waking in the correct sleep cycle. Some alarm clocks use a gentle changing of the color of a light to get this effect.
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