Which of these drugs is causing my insomnia?

[Guest guest]

I'm currently taking:

75mg Indomethacin 2x/day

500mg Sulfasalazine 4x/day

100mg Doxycycline 2x/day

Tramadol as needed, not sure about dosage but about 4 pills a day

I've been taking the Indomethacin for a much longer period of time

than the other three meds, and my insomnia only started when I began

taking the other three. I googled side effects for the other three

drugs and tramadol seems to be the only one that can cause sleep

problems. Basically I can't sleep until I'm dead tired, and even then

it's a very uncomfortable sleep filled with weird dreams. Anyone have

any info?