Heat pads!

[AHLizards]

Hey,

Just wondering if anyone has used Human-Heating pads. Like the ones you would purchase at drug stores ( i think thats where you get em anyway?)

Need something for night-time, without using a lamp.

If you've used them, do you put them on substrate, under it? I use all custom enclosures, so underneath wood wouldn't do the trick.

Ive seen larger mats, for dogs, livestock etc. just wondering if anyone has used these. Share your expierience!
Thanks