All my life I have slept somewhere around six hours during the night, as whatever time I go to bed, or need to get up, I waken three or four times during the night.
Since this time last year, when DH was diagnosed with cancer my night's sleep has gone heywire. To start off with, because he rapidly started sleeping downstairs, as he could not manage the stairs, and needed help during the night, so I slept with one ear open. After his death, I spent three months sleeping when I felt tired, or rather exhausted. Now at last I am slowly getting back to my normal six hours.
I have always felt that sleep - how much we need, and when we need it, is highly individual, and that the insistance when we were children that everyone needed the same amount of sleep has done a lot of harm. I never needed the 12 hours children up to the age of twelve or so were deemed to need in the 1950s, nor the 8 hours recommended for adults from the seventies, when I was a young woman until now.