The fact alone you said "sleepovers" basically tells us your age bracket, for 1.
For 2, it is not Bungie's "philosophy" to include split screen gameplay with this game. If so they would've given it to us on day 1.
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Just because I said "sleep overs" doesn't suggest my age tons of kids play this game that still have sleep overs it was just a example
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Not excoriating, kid. Just observation. No way of telling exactly how old you are through the internet though. My best guess is no older than high school.