There may also be laughing, crying, humming or groaning. Things can get so loud neighbors call to complain, adds psychologist Jodi Mindell.
Triggers are emotional stress, illness, fever.
Other sleep disorders often are present. Dr. Hobson advised using a bedside recorder to monitor frequency, and soon Frank returned beaming. This tape recorder you prescribed is wonderful. The swearing has stopped. I had unwittingly used the power of suggestion on Frank.