I bought a little lamp/fan at Big Lots today $6 that might be useful for in a bunk bed cubby hole.
USB Powered Mini Desk LED Lamp & Fan by ThinkTank Technology
The 12 LED USB Desk Lamp and Fan is a portable and multi-directional light and fan. Powered via USB, it's a great personal lighting and cooling solution for use with your notebook or desktop computer. For convenient use, the lamp and fan both have individual on/off switches and adjustable goose-necks so you can use either or both at just the angle you need. Get better lighting and comfortable cooling while you work at your computer with the 12 LED USB Desk Lamp and Fan.
Two on/off switches - one for the lamp, one for the fan
Twelve Super Bright LED Bulbs
Recessed bulbs are anti-glare
Independent adjustable goose-neck to turn the light or fan to any angle Soft fan blades for safety
Conveniently powered by USB/USB hub
(USB is 5 volts. Pin 1 is 5 V DC, pin 4 is ground.)
The light puts out plenty of light for an enclosed space. Both the fan and the light are attached as separate goosenecks, and turn on and off independently.