keep (some kind of) hours
1. Used to describe one's pattern or schedule of being awake and asleep. Because of the huge time difference, Sam has kept really strange hours since coming back from Japan. It's important the kids start keeping regular hours when they are young, as having unpredictable bedtimes and lengths of sleep can seriously impact on their development.
2. Used to describe one's business hours. The local doctor has always kept rather irregular hours. Sometimes it just comes down to luck whether he'll be there at all on any given day.
keep... ˈhoursif you keep regular, strange, etc. hours, the times at which you do things, especially getting up or going to bed, are regular, strange, etc: Keeping irregular hours is hard on children, so try to set a regular bedtime and a regular time to get up.
See also: hour