No, not all night, but they open at 6am so it's pretty early. They close at 11pm. While I was looking up hours I ran across this that might be of interest:
http://www.raleys.com/www/feature/diversity_community.jsp?featureid=1222746. Snipped: "The Sun City Bike Club meets weekly for morning bike rides throughout the Roseville area. Thank you, Roseville Raley's for setting a great example for community involvement in Roseville."
I've never seen any mention of Susan being involved in biking, but this store was specifically supporting at least one Sun City club.
Another random thought,
I've noticed that overnight the stores are sometimes open for shelf-stocking people, store cleaning peopl[/Bpeo]e, or people cleaning the parking lots. A bunch of the Raleys stores around here remodeled in the last year or two, and a lot of the work was done overnight too. Hmm.. I wonder if this store was remodeled also? I'll check it out next time I'm out that way. It's been so long it's hard to know if it matters, but I'm all in favor of anything that might lead to finding Susan.