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Yes, when dealing with outdoor light cycles, plants sleep with night. Early in the season (March/April) the days are longer so the young plants receive more sunlight [energy] from the sun and later in the season (Sept/Oct) the days are shorter so they sleep more. The changes in daylight hours trigger a chemical reaction in the plant that sends it from the veg stage to the flowering stage. For an indoor grow, it is typically recommended that marijuana plants in the cloning or veg stages receive between 18-24 hours of sunlight, although 24 may stress the plants. Later in their development (flower stage) they are to receive 12 hours of light and 12 of sleep.
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