Sleeping in odd positions is very normal. Dragon, has slept in positions that I ask my fiance how does she (the breardie) not get a stiff back!
As for what the others mention about the red light and the water bowl, as off topic as it is;
Beardies have a light sensor, almost a 3rd eye, on top of their head. Its used to sense shadows of "predators" coming for them. That's why when you're picking your baby up, its best to scoop from in front and underneath. I believe that sensor along with their eyes being near the same visible spectrum our eyes are, makes it very hard for a beardie to sleep with red lights on. Yes, I know many chain store care sheets say to use them, they are just trying to sell you an extra $3 to $5 bulb. If your temperatures are getting lower than about 70 degrees at night, you can do what I do. Place a big, for the enclosure, block under his basking light. and keep the temperature near the high range of the basking temperature when the light is on. That block will soak up what ever heat the dragon doesn't take, much like charging a battery with an alternator of a car. then when the light is off and the enclosure starts to cool, as the rock starts to become warmer than the surrounding air it will radiate the heat off to the area.
As for the water:
From my observations, bearded dragons do not understand the concept of standing water. All it will likely do is raise the humidity, which if it gets too high can cause a respiratory infection. Instead, bearded dragons get their water from the insects and greens they eat. Instead of a bowl of water, I'd keep it as a bowl of collard or mustard greens. Though I will warn you, looking at the size, and guesstimating the age, I doubt the beardie will eat much greens, but the insects will eat them too, gut loading calcium before being eaten.