Some evenings my cats play more than others. I have seen them run and play ONLY after I go to bed. Other times, they will all settle down to sleep when I lay down. Since I opened up the basment of this house to them, there hasn't been the rollicking chase and ambush games going on when I retire for the night. All of the 9 kittens sleep with me on the covers. I wouldn't worry about your kitties keeping you and your neighbors awake for days on end, as this sort of evening playing usually only lasts but for a day or two. I agree, that it is probably the novelty of Lilly and Toby having each other to play with but such behavior can be disconcerting when it goes on at your bed-time. All I can recommend, like has already been suggested, is that you tire them out just before you bed down for the night and then feed them.

......wayne