40% is pretty low. A good target is 60-70%, you can always mist is tank to raise the humidity. Some bps like to lay in water, I have a couple that will do it any time, not just when shedding. BPs also soak in water if they have mites, so keep an eye out for that. My guess is your snake could be shedding and is feeling dehydrated because the humidity is on the low side. Not a big though! Just mist the tank.
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