Last night Herbie decided to sleep at the top of his cage upside down gripping onto the screen. He has never done this before and I was really worried that he was going to fall in his sleep so I kept checking in every hour or so but he never fell.. Is this something I should be worried about? I keep the temperature during the day between 80 mid tank-98 at the hottest basking spot, and night time drops to about 65-75...

I'm not sure about the sleeping, maybe he was just there when the light turned off and fell asleep?
What kind of chameleon and how old? Because I think 98 for a basking spot is wayyyyy too hot, especially if it's a baby like what it looks like in your avatar.

Edit- Oh duh, it's a veiled. lol. Yeah, 98 is extremely hot. A young one should have a basking spot of 82-83, and I'd say mid cage mid 70s. Night temps are fine.

I wouldn't worry about it too much. When and if she/he falls then its time to worry.

__________________
2.1 Veiled Chameleons | 2.0 Panther Chameleons - Glacial Lakes Herpetological Society and Reptile Rescue

Mine did that too. More than likely thats just where he was when he fell asleep. My veiled falls asleep wherever he is once his lights go off.
I wouldn't be concerned, I doubt he will fall. Thats what the toenails are for

He's around 5 months now... All of the research I have done told me to have a basking spot of 90-105 degrees... Too hot? That picture was from when I first got him, he has at least doubled in size now.. I have a current picture in this thread: Herbie starting to show his handsome design!

Yes, still way too hot. Mine is 7 months and his basking spot never goes over 85. In a few months I'll raise it a little.

Here is Jannb's blog on raising veileds. Lots of great info.
"You probably will not need a basking light right at first if he's young.....under 4 months old. He'll be so young he'll only need to bask at about 80 to 82 until 4 or 5 months old. Luie (my adult male veiled) bask at 88 or 89 for an adult panther 85. You can use a household bulb and you'll have to keep testing the temps. (25 to 40 watt or so)"
http://www.chameleonforums.com/blogs...hameleons.html

ok I wondered about this too, BUTTTTT!! mine was sleeping hanging upside down by her back legs and tail!! she slept like that for about 6 hours until i went to sleep then the next morning she had her front claws in the screen too!!! it was sooo crazy I was so scared she was dead or dying!!

Chameleons often sleep upside down, it's nothing to be concerned about unless he/she is sleeping during the day.