Where's Dad gone?

Mum says that from now on I won't see much of Dad during the daytime because he's "gone back to work". I still don't understand what "daytime" is, but I'm beginning to gather that it's when I should get most of my sleep. As opposed to "nighttime" when I should be entertaining Mum & Dad with crying, possetting and long wide-awake periods.

I know what Dad does all day, so his work must look something like this: