Originally Posted by
unterhausen
…It gets cold at night in most of the U.S., even in summer. It's worth figuring out how you are going to do this and take the clothing on shorter rides to make sure your plans are workable.
This is true, but even if the ambient temperature didn't drop, your body has a natural rhythm, and will
feel colder around 3 AM. I've also found that my thermal regulation goes haywire when I'm exhausted, but that might just be me.