M.M.
We just went through this with our 4.5 yr old. He'd been waking up over night for almost 2 yrs, and we finally took him to a sleep doctor.
Nothing was physically wrong with him, so it was clearly behavioral.
So, we wound up at a sleep specialist.
She had us totally change his routine (had been the same since he was an infant).
For us, it was no TV after dinnertime, only books after tub, no sugar after dinner, and an earlier bedtime. He now goes to bed at 7:15.
She also had us get an alarm clock that tells him when it's OK to get out of bed (the whole clock lights up green). He can't get out of bed before then...and it's actually worked.
It took about a week for him to adjust, but I can honestly say we've had more nights sleeping all the way through, an no more night terrors, than anything else for the last 2 mos.
Based on what we experienced...both the doctor and the specialist would tell you to get rid of the night lights. She needs to sleep in a dark, quiet, cool room.
She does phone consults, if you'd like her information. It's $125...and for us, it was worth every penny. She knows her business!