I put the hamster in front of the window last night. I saw the hamster stiff this morning (not dead, just a little stiff), and then

Your hamster was in pseudo hibernation before, and it's really a great fate to survive.

Let it go back to the cage. Fill the cage with cotton to keep warm.

If you want to supplement nutrition, you'd better feed some glucose.

Don't feed blackcurrants. People eat too much sugar, and they can't digest it after feeding it.

Feed the rat food normally, just pay more attention to observation.

That's all.