Top ten reasons my children are in my room in the middle of the night:
10. "I had a bad dweam."
9. "I'm sirsty."
8. "Come wipe my buuuuuutt!"
7. "My eyes are open."
6. "I'm itchy."
5. "Der's a skeleton scwatching in the closet."
4. (vomiting noises)
3. "I was worried about somefing."
2. "I'm hungwy for bwekfist."
(I'd like to take this opportunity to suggest that maybe, just maybe, if they would simply EAT their SUPPER, they would NOT be hungry at three o'clock in the morning ALL THE @&!$%*! TIME.)
(But I digress.)
The number one reason my children are in my room in the middle of the night, although it's never presented in quite so many words, is:
1. Reducing competition.
Think about it: if you're an owlet or a hyena or something and resources are scarce, you can just eat your siblings; if you're a small human and you don't want to share your toys, really, what are your options? Not only are you lacking the sort of hardware (teeth, claws, etc.) that would allow you to destroy them, you have the vague sense that probably get in trouble for trying and besides, you really only like to eat macaroni and cheese anyways.
The solution is to prevent your parents from ever wanting to have more children by rendering them so insane with sleep deprivation and groggy rage that they frequently can't recall what possessed them to think the first ones were a good idea. And just for good measure - in the event they happen to be stupid or placentamental enough to consider having more children - to make it essentially impossible for them to ever have sex again.
Zero propagule pressure = zero little brothers or sisters running around tattling on you and touching your toys and generally wrecking your young life = WIN.