Has a teacher referred to sleep as a form of 'lazy nirvana'?

The other night at a group meditation meeting, I mentioned to another practitioner that sleep is a 'lazy form of Nirvana'. My memory tells me that Tara Brach or another teacher jokingly referred to sleep in that way, but after looking on Google, I can't find the reference :\ I would feel a little guilty if my reference was false, but I know that Nirvana is in a lot of ways the opposite of sleep and I'm sure she did too. I ask this as a joke, but has anyone heard of sleep referred as a 'lazy form of Nirvana?' If so, which teacher made that reference?