5-6.5 hours sleep at night, 1-2 20 minute naps during the day. Also: 1-2 days a week of 7-9 hour sleeps (weekends, lazier work schedule). Sleep + nap is gener

5-6.5 hours sleep at night, 1-2 20 minute naps during the day. Also: 1-2 days a week of 7-9 hour sleeps (weekends, lazier work schedule). Sleep + nap is generally more productive for me, though on the low end (6 hours or less total daily), I hit burnout much sooner.