Last night I checked on my snakes (uk time) and the heating was not working, they were at about 21C (69-70F), I relised there was low electricity in all the plug sockets, none of them worked. I was extremely worried so I fiddled with the electricity but it didnt work, I had no hand warmers and no shops open so I put duve's, towels, loads of other stuff on top of them for the night. I woke up this morning and they are at 19C (66F). What can I do and at what temperatures can they survive at, are they in danger????? There are only corns and BP's.