7-8hrs is optimal for me! I can pretty much wake up like clockwork exactly 7-8 hours after I went to bed without an alarm because I'm DOA the moment my head hits the pillow and I sleep very restfully. If I wake up in that window and decide to be lazy and snooze longer, I just feel groggy and headachy and worse than if I'd just gotten up when I was refreshed.
If I have to get up with less than 7 hours' sleep, I can function, but definitely not optimally.
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7-8hrs is optimal for me! I can pretty much wake up like clockwork exactly 7-8 hours after I went to bed without an alarm because I'm DOA the moment my head hits the pillow and I sleep very restfully. If I wake up in that window and decide to be lazy and snooze longer, I just feel groggy and headachy and worse than if I'd just gotten up when I was refreshed.
If I have to get up with less than 7 hours' sleep, I can function, but definitely not optimally.