What is definition of '7 hours of sleep'?

when people talk about sleep in general, it means 'bed time

I don't think that's true. When people talk about sleep they're talking about being asleep, not lying awake in the bed. If I go to bed at midnight and watch tv for 2 hours, fall asleep at 2am and wake up at 10 am, I don't think that I slept for 10 hours simply because I was located in the bed for 10 hours. I would say I slept for 8 hours, from 2am to 10am. I think that's how most people define sleeping.

However, I wake up a lot and toss and turn, but fall back asleep within seconds each time. I would still call it 8 hours of sleep, but I wouldn't call it 8 hours of deep or quality sleep.

/r/sleep Thread