"Forty winks" is a colloquial phrase that refers to a short nap or snooze, typically lasting no more than 20-30 minutes. If you're looking for synonyms for this term, there are plenty of options to choose from depending on your style and tone. Some alternatives include "catnap," "power nap," "siesta," "doze," "nap," "rest," "snooze," "slumber," "naptime," and "midday repose." Each of these phrases offers a slightly different take on the idea of taking a brief rest, so think about which one best fits the context and mood of your writing.