Hello, welcome to the forum, and I'm so sorry this is happening...we can certainly try to help you, but we need a lot more information about him and his enclosure/lighting and just his set up in general.
Can you please post a current photo of him, and then one also of his entire enclosure/tank and then his lighting? You can do this by taking the photos on your phone, then go up top to the link that says "User Image Uploader" that is in the bar at the top of the website. Once you're there you have to upload each photo you want to post individually to your account, and then once you get them all uploaded, come back to this post and click on "Post A Reply" and the message box will pop up. The you just click on the "XIMG" button that is right above the message box, then you select the photo you want to insert and it will be inserted inside the message box wherever the cursor is.
First of all, how old is he? Did you buy him at a pet shop, like Petco or Petsmart? The reason I'm asking that is usually the babies they sell are around a month or so old, so that can help us figure out how old he is if you got him in April. How many inches long is he from the tip of his snout to the very end of his tail?
99.9% of the time when this happens, when they stop eating, become lethargic and sleep a lot, etc. it is due to the owner using a
UVB light that is not strong enough or adequate for a Bearded Dragon, having improper temperature zones inside their tanks, and having their
UVB light (which is usually improper to begin with) mounted improperly. What I mean by that is that usually people have very weak UVB lights that are not appropriate for a Bearded Dragon to begin with sitting on top of the mesh lid of the tank, which blocks around 40% of the
UVB light emitted. Also, often they have the
UVB light too far away from their dragon's basking spot, so basically their dragon has not been getting ANY
UVB light at all since they got them. Also, most people who just start out with their first bearded dragon use those round, stick-on thermometers or a stick-on aquarium strip thermometer, instead of using either a Digital Probe Thermometer or an Infrared Temperature Gun. You cannon use a stick-on thermometer for a Bearded Dragon, #1) You cannot measure their Basking Spot Surface Temperature with any type of stick-on thermometer, it's impossible, they only measure the Ambient (air) temperatures, and then #2) All stick-on thermometers are very, very inaccurate, and when tested they are often off by between 10-20 degrees.
Bearded Dragons are not "beginner" reptiles as many people and websites say, they are no where near as easy to care for as some of the tropical reptiles, and this is because they are Desert Reptiles that require very specific lighting and temperature needs. Specifically, they must have at least 13-14 hours every single day of both a strong, adequate UVB tube and a bright-white colored Basking Bulb that puts their 3 temperature zones within the correct ranges. If you bought his equipment from a pet shop and were educated by a pet shop employee, or you bought one of those "Bearded Dragon Starter Kits", then it's very likely that the
UVB light you have is totally inadequate, you're using a stick-on thermometer and have incorrect temperature zones, etc. Because of this, it's important that you try to be as specific as you can in telling us what lights you have, what type of thermometer you use, what the 3 temperature zones are inside his tank, etc. So try to answer these following questions as specifically as you can for us:
1.) What
UVB light do you have? Try to list the brand name, the model, wattage, and strength, and what shape/type it is, meaning is it a Compact (regular lightbulb looking), a Coil (regular lightbulb looking but a spiral/twisted bulb), or a long flourescent tube that is at least 18" long and is housed inside the same length, long tube fixture?
2.) What type of Basking Bulb do you use, meaning is it just a regular lightbulb or is it a coil/spiral bulb? What color light does it emit (white, red, blue, yellow, etc.)? What is the wattage of your Basking bulb?
3.) How many hours do you leave both of these 2 lights on every day?
4.) Do you have any additional lights?
5.) Is your
UVB light sitting on top of a mesh lid? Is it obstructed by anything else, such as a plastic cover on the fixture over the UVB tube itself (this usually only applies to a long tube)? How far away, in inches, is your
UVb light from your dragon's Basking Spot/Platform? How old is your
UVb light? Did you buy it in April when you got your dragon and not replaced it since?
6.) What do you use as a substrate in the bottom of his tank? Is it a loose substrate such as sand, crushed walnut shells, bark, etc. or is it a solid substrate such as tiles, shelf liners, newspaper, paper towels, reptile carpeting, etc.?
7.) What type of thermometer do you use to measure his temperatures inside his tank (stick-on, Digital Probe, or Gun)? How often do you check his temperatures?
8.) What are the Basking Spot Surface Temperature, the Hot Side Ambient (air) Temperature, and the Cool Side Ambient (air) Temperature?
9.) What type of live insects do you feed him? What size are they? How many do you feed him per day when he is eating normally? How many is he eating now?
10.) Do you give him a fresh salad of greens/veggies every day? If so, what types of greens/veggies do you feed him?
11.) Do you give him a Calcium Supplement? If so, which one and how do you give it to him (dust his live insects, sprinkle on salad, etc.)? How often per week do you give him Calcium?
12.) Do you give him a Multivitamin Supplement? If so, which one and how do you give it to him (dust his live insects, sprinkle on salad, etc.)? How often per week do you give him a Multivitamin?
13.) Do you feed him any "Commercially Sold" foods, such as pellets, freeze-dried insects, freeze-dried greens/veggies, etc.? If so, which ones and how often?
14.) Does he have a glass tank with a mesh lid, or does he have a wooden enclosure? What size is his tank/enclosure, either in gallons or the dimensions (length, width, height)?
Try to answer all of these questions as specifically and adequately as you can, and post the photos of him and his enclosure/lighting. ****YOU CAN USUALLY FIND ALL OF THE INFORMATION ABOUT YOUR
UVB LIGHT AND YOUR BASKING BULB WRITTEN RIGHT ON THE BULBS THEMSELVES, IF YOU YOU DON'T STILL HAVE THE BOXES.****
Don't give up all hope yet, if his issues are in fact related to an improper
UVB light, temperatures, etc., which they probably are, usually immediately getting him the correct lighting, temperatures, etc. will cause a positive result within 24 hours, that's how crucial proper UVB lighting and temperatures are to Bearded Dragons and all other Desert Reptiles.
