At 8pm, and then 10pm, then 10:30pm, then 12am, then 2am, then 3:30am, then 5am.

Or waking them up for school... (A correlated problem)

My mutant power is the ability to put babies to sleep. Before I had my own I'd put other people's kids babies to sleep easy peasy. It's something I've been able to do since I was a teenager.