You can do playtime whenever is convenient for you. They do tend to sleep late morning and early afternoon but they usually don't mind being woken up. They are active within a few minutes. You should not let direct sunlight shine on a cage or it can over heat your chins but sunlight during the day is good. Most animals need a day/night light schedule even if they sleep during most or all of the day.Feed unlimited plain pellets and hay. As long as your pellets are a good formula and not a mix with a bunch of treat junk in it they will not over eat. Chins only over eat on rich treat type foods.