Keep an eye on his belly - it's possible for them to develop water blisters from too much soaking. Make sure you change the water frequently to avoid any bacterial buildup that can lead to scale rot, also. Aside from that, just make sure he has hot and cool side hides (they sometimes use the water bowl if there isn't a hide option on that side), weight stays steady, and your husbandry is correct, and you shouldn't have to worry.
PS: BPs don't hibernate, so I would be very careful about any advice those specific people give you in the future.
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