 So what do these things have in common, sleeping in a hammock, drawing, and reading out loud? According to neuroscientists, they can all improve your memory. Let's start with the hammock. According to the University of Geneva, the rocking motion of a hammock is ideal for sleeping. In an experiment, the researchers found that those who had slept in a hammock the night before a memory test performed better than those who had slept in a bed. Another memory trick.