Sleep appears to play a key role in helping the brain consolidate the memories it forms during the day. While past research has indicated that you can’t form new memories during sleep, a new study has found that the brain can establish new associations while sleeping. There’s a catch, though: its capacity may be limited to certain types of memories—in this case, ones associated with the sense of smell. Plenty of experiments have looked at the role of sleep in consolidating memories. Read the full story at ARS Technica.