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Usually yes, for some reason the past few weeks I've felt fine.

Maybe just because I've been so busy/energized, maybe because I've been doing yoga every morning and exercising during the days, maybe something else.

Also, discomfort is usually your body giving you a hint: stop doing that. If the amount of sleep you get leaves you feeling good, there is very little chance you are hurting yourself.

Six hours is definitely not something that makes me uncomfortable over the mid term (multiple years) but eventually catches up. Four hours doesn't feel uncomfortable for me until about a month or two of sustained low sleep.