Technically, yes and no. Torpor, a state of reduced metabolic
activity for a short time, does happen in humans when they sleep.
However, the rate of decreased metabolism and drop in temperature
is pretty insignificant when compared with the likes of humming
birds that undergo torpor in the evening/night. Therefore, few
textbooks call the human sleep a state of torpor. The upshot is
that humans DO NOT experience torpor.