Must I wash Negel Vasser after a nap?

Must I wash Negel Vasser after a nap?

Upon awaking in the morning we wash negel vasser (ritual washing of the hands in an alternating right/left pattern) to remove the vestiges of impurity acquired while we slept. But what about napping during the day—is the washing in the morning due to a ruach ra (a harmful spirit) that may have affected us during our nighttime sleep, or is any sleep, even during the daytime, cause for spiritual cleansing?

The recommended practice is to wash negel vasser even when waking from a daytime nap, though we do so without a brachah. But not all naps qualify; the measure of time that requires washing is shishim neshimos (the length of sixty breaths). The exact quantity is the subject of debate, with an array of shitos (opinions): a strict three minutes, a half hour, an hour or even three hours. The common custom follows the shitah which requires washing after a half-hour nap, though there are many halachic sources that reckon shishim neshimos as a full hour.

A daytime nap, even for those who are most stringent, does not require washing near the bed, as is the established custom for morning negel vasser. #623

https://halacha2go.com?number=623

Practical Halacha: One minute a day. By Horav Yosef Yeshaya Braun, shlita, Mara D'asra and member of the Badatz of Crown Heights.