I usually think that a snake that is nervously roaming the enclosure, with jerky movements, and not eating, striking when the bin is opened... things like that make me think it is stressed. Or remaining balled up 24/7.
I'm usually pretty relaxed about husbandry. If your snake is healthy and eating, it's probably fine.
The things that I usually insist upon are temps within a reasonable range, and humidity(although as long as the snake is having whole sheds, I will refrain from compalints about humidity). I've heard people say that the temps drop to 65F at night, and that does get a response. But if the temps are above say... 75F and below 95F, I tend to be relaxed about it.
Mine are all kept at a even temp of about 85-90F 24/7. I use anything from back heat in the racks, to a room heater hooked to a thermostat. It's all worked really well in my opinion.
My snakes are generally relaxed, not roaming trying to escape, not too snappy when I open the bins, not balled up constantly, and rarely ever refuse to eat, even when in shed. So because of that, I feel they are "happy". I'll interpet "happy" as "content and comfortable".
Hope this helped.
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