The CDC has released a printable brochure entitled Quick Sleep Tips for Truck Drivers.
The brochure includes tips such as:
Keep safety in mind. Park with a balance of quiet and safety in mind.
Block out all light. Close all curtains and truck shades, or use an eye mask.
Block out noise. Use ear plugs or a “white noise” machine like a fan to block out noises. Silence phones and assign an audible ringtone to important contacts to minimize distractions.
Keep your cab or bedroom temperature cool. People’s temperature preferences vary, so keep your room temperature comfortable for you.
Get comfortable. You spend one third of your life in bed, so use a comfortable mattress and pillow. Consider upgrading or replacing the mattress in your sleeper if it is old or uncomfortable.