Aspen, Colorado was woken up by one earthquake and then a follow up earthquake. The first one was around Glenwood Springs with a 3.2 magnitude. The second one a 3.6 magnitude around 4:07 am.

For more info, please read the original article by LA Times:
https://www.aspentimes.com/news/two-early-morning-earthquakes-rattle-glenwood-springs/