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Light ther­apy is un­der­stood to af­fect brain chem­i­cals linked to mood and sleep. Mim­ick­ing day­light, it’s com­monly used by peo­ple with sea­sonal af­fec­tive dis­or­der (SAD) but has also been used to treat de­men­tia, depression and even can­cer-re­lated fa­tigue (CRF). Pa­tients un­der­go­ing chemo­ther­apy can ex­pe­ri­ence dis­rupted cir­ca­dian rhythm, and re­cent re­search showed that cor­rect­ing their sleep-wake cy­cle with light ther­apy could de­crease CRF.

Cor­rect­ing cir­ca­dian rhythm can also help jet lag. Al­though it’s un­clear why, stud­ies have shown that re­cov­ery from it is worse for women and for older peo­ple in gen­eral. In ad­di­tion to feel­ing tired at the wrong time, cross­ing time zones can cause dizzi­ness, headache, ir­ri­tabil­ity, in­di­ges­tion and even mem­ory loss. To help right your rhythm, use light ther­apy the morn­ing of de­par­ture – if you’re go­ing east – or in the evening – if you’re go­ing west – for 30 to 60 min­utes the day of travel and 15 to 30 min­utes the day after. Medicine Hat-based The Lite­book Com­pany of­fers two light ther­apy boxes in­clud­ing The Edge, a por­ta­ble smart­phone-sized model ideal for travel.

$180, lite­ —Tara Losin­ski

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