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Hello @Breath, have a warm welcome to the Fitbit Community, it's great to have you on board. 
If you'd like to delete your sleep logs, open the Fitbit app and tap on the Sleep tile, then tap on each individual sleep log. In here you'll be able to see an ellipsis (...) icon on the top right corner of the screen, tap on it and select Delete Sleep Log. Unfortunately, at this moment it's not possible to delete sleep logs in bulk, which means that if you'd like to delete logs from various days in a row, they must be deleted one by one.
I hope this can be helpful, give it a try and keep me posted in case you need anything else. 
Best Answer