Am I being crazy?

My 21 month old was going on almost a month of sleeping like absolute crap. She was only ever sleeping a half hour to 1 1/2 hours for a nap then waking up numerous times throughout the night & ending up in my bed bc she just refused her crib. Since Saturday night, she has done a complete 180 sleeping 2+ hours during the day & then 11-12 hours at night waking up none to 1 time. Am I crazy being worried about this sudden change? She’s not acting sick, still eating, still playing normal, maybe a little more cuddly after nap just wanting to watch tv for a little & no temps. But I’m not sure why I’m worried about this sudden change in sleeping behavior? Just looking for some advice or if this is normal?