The phrase "spot of sleep" refers to a short nap or rest that one takes to recharge oneself. There are several synonyms for this phrase that can be useful for expressing the same idea in different contexts. Some of the synonyms for "spot of sleep" include catnap, power nap, snooze, siesta, doze, nap, rest, and slumber. Each of these synonyms has slightly different connotations, so it's important to choose the right one for the situation. For example, "catnap" might be appropriate for a brief rest during the day, while "slumber" might be better for a longer, more restful sleep. By using these synonyms, one can add variety and nuance to their language.