Same here. I tend to average 5-6 hours most "nights". When I'm working a normal job I tend to manage by sleeping 6 times a week since that was easier for me to keep going schedule-wise than a 7-day week. Now with the startup I sleep a bit less -- not because I have to be up so much as I just wake up after 4-5 hours most of the time with the always-long list of to-dos going through my head. About once a month I'll hit a phase where I'm a little burnt out and sleep for 8-10 hours for three or four days in a row.