Do light therapy boxes work for people with insomnia? are there any side effects?

The cause: of insomnia needs to be established before recommending any therapy.

May: Be effective for some people. Especially in those who have little exposure to light through out the day

Light therapy: Light therapy has been used to treat: Jet lag, transitions to night work schedules, shift work related sleep disturbances, Delayed Sleep Phase Syndrome (DSPS), Advanced Sleep Phase Syndrome (ASPS), non-24-hour sleep-wake syndrome & age-related sleep maintenance insomnia. For risks of light therapy see: http://www.mayoclinic.org/tests-procedures/light-therapy/details/risks/cmc-20197423