Choose 60 gsm or 90 gsm Alpha Direct for Sleeping?

Are you asking which weight to use as jammies, or are you thinking of making a quilt out of it?

For jammies, I have AD 60 pullover and pants, and they are  great for that, and as my main warmth layer for summer in the Sierra. I also have some pants in 90, and they are warmer than I need in the summer.

Looking for jammies.

I’ve been working on this for a while and here is what I’ve found.
I use a 30 degree Zpacks quilt…a Nemo Extreme Pad and a light Borah Bivy.  No tent just a SlingFin tarp above me if there is weather.

I’ve found my legs get cold on the pad a lot of the time.  I’ve moved to a 90gsm pair of FarPointe Alpha pants with a 120gsm on top.  I sleep high much of the time in the Eastern Sierras so I’m looking at summer temps in the low 40s down to the low 30s…sometimes high 20s!

The 120 is a bit overkill and some nights I’m sleeping wide open…but…the 120 is my only warm layer and I wear it sometime in the morning for an hour or so to get going.  This has worked well for the last two summers.  This summer I’ve gotten in about 35 nights up there and I haven’t wanted to change it once.

Honestly, this is so personal. I don’t think anyone else can tell you what you need for sleeping comfort. Id suggest trial and error. Gender, age, hydration, nutrition, tent, pad – all of these things might matter more than the thickness of a fleece layer.