Nikon D5100 Sleep Mode?

I have a Nikon D5100 and I've tried setting it up for silly little photobooths at parties with a remote and it's been a hit, but after a while of inactivity the camera goes into sleep mode and the remote is then shut off so then I have to go reset it up for the remote.

Is there anyway to keep it connected to the remote or even a way to turn off the sleep mode? I have another party tomorrow and was hoping to get this settled so I don't have to worry about it.

Thanks.

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