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Hello @TangMother, have a warm welcome to the Fitbit Community, it's great to have you on board. 
I appreciate you have brought this to my attention and for letting me know you have already tried to edit the Dashboard but the Sleep tile is still not showing to be added. Usually when a tile is not showing in the Fitbit app and it's not showing as hidden is because your tracker has been removed accidentally from the account: To check this, please tap on the Account button and verify that your tracker is listed under your Name. If it's not, please set it up as a new device:
- Open the Fitbit app and tap on the Account symbol at the top right corner of the screen, then tap on "Set up a New Device"
- Choose your tracker and follow the onscreen instructions to continue
I hope this can be helpful, give it a try and keep me posted in case you need anything else.
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