I never have any trouble sleeping, so I aways feel well rested. On a usual night, I will get 6 ½ hours sleep, but if I am going out for the day, I will get up early, and get bout 4 hours sleep. I often have kips in the afternoon though.
Currently not getting enough sleep as my baby seems to be having a growth spurt so he's enjoying night time feeds. I'm constantly amazed at how you just adapt with lack of sleep. In my lazy uni days I remember languishing in bed for whole mornings at times but now there's so much to do and be done that whether I get 4 or 8 hours sleep (I wish), the show must go on so you just get through the day. Sometimes its now the case that the more sleep I get the more groggy I feel. Oh well.