Near record low temp for place and date in central NJ, 56 Fahrenheit before 5:30 AM sunrise. So, what started as pleasantly cooler and barely breezy 'round midnight (in cotton pants, shirt, & cotton vest-sweater, at a newly found site by the water tower,) was vaguely uncomfortable during the night as temps dropped and cold by full wakening around 6AM. That's with weather-shield.
I should have ridden once up at sunrise, but instead I walked home to retrieve an Arrowhead 2/3 under-quilt synth Rip Waverly waved away here (in favor of his others), my first.
Long story short: after fumbling to set it up: Surprise after getting in at the same experience of immediate warmth of a down bag -- no mass to warm first -; and then out so solidly for 2+ hours as to miss a 9:30AM dental appointment.
So, noobs like me: You may not know how fitfully you've slept until comfort lets you sleep real well. This (highly compressible) 1lb UQ is the loving arms of Morpheus (when he was 2/3 grown).