My 9.5month old plays at night

Dee • Mama to my beautiful baby girl. Born April 2019 💜

Her general sleep at night has improved quite a bit, but now she’s doing this new thing of waking up in the wee hours of the morning to play. She is wide awake and chirpy and playing for about 15-20mins and then falls asleep again.

Anyone else’s LO do this? How long did this phase last?