Yes, you can. Technically there are long-term and short-term portions of the lot, but I've never seen tickets on cars parked in the short-term spaces overnight. The lot is lit and appears to be relatively safe since it is in a suburban neighborhood. I've never seen broken glass on the ground. Some commuters from Orange County leave a second car parked there every night and over the weekends.
Old Town, on the other hand, is completely different issue...