PSA: If your sleep does not sync READ THIS!!!

There is currently a bug with sleep research in the USA where DST happened last night.

Luckily the fix is simple:

Force quit the app from your app settings.

Then go to your Date/Time settings, change your timezone manually to anywhere outside the USA. UK works, Norway works, Saskatchewan works, even Arizona should work as it does not have DST.

Then reopen the app, sync your sleep, do your research. Afterwards you can reset your timezone to automatic.