Yes, at Sacramento Airport(SMF Airport code), you can sleep. Several travellers have shared that the terminals are clean and sleep-friendly. Being clean, you can find multiple spots at the airport to rest. It has comfy chairs in different parts of the place. It has been found that the passengers can access armrest-free benches to relax. In the neighbourhood of Terminal B, there are also several nice sofa beds. These beds can also be used for resting.