One of the bonuses with light therapy is that when it works, it works fast. This is not like the SSRI "start taking this and see if you're improving in 6-8 weeks".
(You can also feel if you've overdone with a dosage time that's too long, if you start feeling like you've downed ten espressos.)
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(You can also feel if you've overdone with a dosage time that's too long, if you start feeling like you've downed ten espressos.)