Sleep regression Is sleep regression possible at 7 months? My daughter has basically slept from…

Sleep regression

Is sleep regression possible at 7 months? My daughter has basically slept from 9pm-6am since she was about 5 months old. Occasional wake ups, but generally solid sleep. For the last week she's been up 2,3,4 times a night-wide awake. Laughing, singing, playing kind of awake. She and my son share a room and if we leave her in her crib she stands on the side closest to his bed and yells and bangs on the crib until she wakes him up because she wants to play. She's usually up for at least an hour each time she wakes up, so needless to say, I'm exhausted. Is this normal at this age? Is there anything I can do? It's 3am and she's crawling around the living room as I type this...