I take a lot of meds such as haldol (haloperidol) 5mg, lamictal 400mg, lithium 900mg, cogentin, humira and I'm tired/sleepy alot. Is this due to depression or meds?

Could be both. Meds and/or depression can cause fatigue and sleepiness. Checking a lithium level is a good idea. Talk to your doctor about your symptoms.
Could be medd. Could be the meds.
Lithium. Need to talk to your doctor about lithium workup. Lamictal/lithium combination can affect their level.