Maybe...I am yet to see any heated shrubs yet though in desert or coastal areas in Aussie.
There is plenty of research about it being good for lizards to chill a bit at night as it reduces their metabolic rate....makes them live longer.
Every knows that reptiles need a heat source, but they need it in order to digest food and be active- not 24/7.
If in doubt I think its best to imitate their natural environment where their morphology, behaviour, metabolic enzymes etc etc have evolved over 10's of millions of years.
Compare a slow grown red ear or snake neck turtle (natural conditions) to one from a heated tank 24/7 and you'll see that one of them looks a lot healthier than the other....same goes for whistling tree frogs- they thrive in 15-20C, but don't do so well above 25C.
I raised my first lot of water dragons with the 24/7 heat and they grew really fast....pity about the low fertility though.
Inland BD's, Coastal BD's, Water Dragons all require brumation...not a good idea to heat at night then suddenly stop doing that when you brumate them I would think, yeah?
Anyone got an opinion on this or am I just being a cheap a-se?