How to take a really great nap<br>Plan a nap into your day. Planning ahead for a time in your day when your body can catch up on zzz's will help your body prepare for sleep when it comes. Additionally, just knowing a nap is coming is enough to lower your blood pressure.
Taking a nap prepares your body for the next day
The context never said anything about preparing for the next day, only for sleep. I think the system had difficulty because i used lots of words from the question
( z1 prepare :ARG0 ( z2 nap :ARG0 ( z3 you ) ) :ARG1 ( z4 body :poss z3 ) :ARG2 ( z5 day :mod ( z6 next ) ) )