PC sleep mode

Does putting a PC to sleep use much electricity compared with shutting it down?

I usually shut my PC down when I'm done using it to save electricity. Does sleep mode use much power, or is the difference pretty small?

Should I put my PC to sleep or shut it down overnight?

I use my computer every day and want to know which is better for its long-term health: leaving it in sleep mode overnight or shutting it down completely.…