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Affect your mood. jenna: what about night lights for kids? >> no, i don't think so that it is a good idea. do it as purpose to get around. it is not good to leave light on at night for any reason. it affects the pattern of sleep. ultimately it could affect you. kids are little. they're young, it is not a big problem. people like myself, we want everything dark. jenna: we have to get to the next study as well, dr. manny. jon you want to take the mantle for this one. jon: this is called the sit test. jenna: literally a test. jon: people getting up there in years. the challenge to sit cross-legge...

>> shepard: survivors of an avalanche that killed nine climbers and left six others missing say disaster struck as they sleep. the avalanche hit about 4:00 in the morning on sunday on the world's 8th tallest peek in the mountains of nepal as two dozen climbers were asleep in their tent. italian man that survived said he and a fellow climber couldn't see a thing when that avalanche started rolling down on their tent in the mountain. >> we were sitting down. everything dark. without food, without clothes, without lamp, without nothing. we stay for an hour waiting for the light of the sun. >> she...