We wanted a simple LED light to come on when we lifted the bed to access the storage area.
Found one at Lowes for $13. Seems to work just like we wanted. Several other "motion" activated lights did not work well enough.
This light mounted under the bed deck in the existing recess created by the deck supports. No loss of storage, easy access and maintenance. Every inch of the storage area is lit with little to no shadows.
Shop ecolight 6-in Battery Under Cabinet LED Light Bar at Lowes.com