To go back to sleep within 1 hour after waking up, usually because one has stayed out too late the night before or is hung over.
Re-Sleep is differnt than a
nap since it is so close to the actual night
time sleeping, any sleep after the 1 hour limit is called a
nap.
She was so tired in the
morning that she went back to
bed almost immediately, trying to re-sleep. By trying to re-sleep she could avoid the negativeness of taking a
nap and could honestly say she got up a 8 AM.