Since you haven't answered the questions in the how to ask for help thread I can't tell you what's up with your chameleon so ill just give you some information that might help...
Appropriate basking temperature allows for proper digestion and thus indirectly plays a part in nutrient absorption. Male veileds basking temperature should be in the mid to high 80'sF. Females in the low to mid 80'sF. You can use a regular household incandescent light bulb for the basking light. Wattage is determined by the temperature you need to provide.
The most recommended UVB light is the long linear Reptisun 5.0. UVB exposure allows the chameleon to produce the D3 needed to use the calcium in the system.
The crickets, roaches, locusts, superworms can be fed a wide range of greens such as collards, escarole, endive, dandelion greens, kale, etc and veggies such as carrots, sweet red pepper, squash, zucchini, sweet potato, etc.
The chameleon should be fed an assortment of insects such as crickets, hornworms raised on an appropriate diet, silkworms, roaches, locusts, superworms, once in a while wax worms, etc.
Since many of the feeder insects have a poor ratio of calcium to phosphorous we recommend dusting the insects just before feeding them to the chameleon with a phosphorous - free calcium powder to help make up for it.
They should also be dusted twice a month with a phosphorous - free calcium / D3 powder to ensure that it gets some D3 without overdosing it and leaving the chameleon to produce the rest of the D3 from its exposure to the UVB light. D3 from supplements can build up in the system and lead to health issues while D3 from exposure to UVB won't likely as long as the chameleon can move in and out of the UVB when it wants to.
It's also recommended that you dust twice a month with a vitamin powder that contains a beta carotene ( prOformed ) source of vitamin A. PrOformed sources of vitamin A cannot build up in the system and lead to overdoses like prEformed sources can and will leave it up to you to decide whether the chameleon needs prEformed or not.
It could be the heat or the lighting or any number of things that have made your chameleon sleep during the day. We need more info.