Overdosage can make you feel "wired" and overstimulated - if this happens, decrease the time or intensity of the light treatment.
The long-term effects of bright light treatment are not yet known.
You can do other things in your morning routine while under exposure to light, but you may still need to wake up earlier than you normally would, so you can get enough light before leaving the house in the morning. You don't have to get out of bed for light therapy, as long as you keep your eyes open.
Equipment for light therapy can cost several hundred dollars (Canadian or US). If you have a doctor's prescription for light therapy, and extended medical insurance, your insurance plan may cover it.
Requires some time - a few days to two weeks - to take full effect. During this period, you will probably feel sleep-deprived.