Light therapy is typically used to help treat circadian rhythm disorders rather than insomnia. With that being said, light therapy can be used in the late afternoon/very early evening to help delay sleep onset if you are struggling to stay awake until the start of your sleep window.
It can also be helpful in the morning to help shake off sleep inertia — but I suspect it won’t do too much to restore sleep drive compared to simply allotting less time for sleep at night, avoiding naps, and observing a regular sleep window.
I hope this helps.
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