It's been two days after I have taken misoprostol for medical abortion. I've been feeling extremely tired to the point that ill fall asleep. Normal?

Not from misoprostol. It may be the stress of the situation but use the downtime efficiently, it's better to be relaxed going through this and you may have gotten pain meds which contribute. If bleeding heavily it could be different. What you are doing is stressful, the diagnosis, the decision, you may just need the rest but it's not from misoprostol.
Misoprostol. Doesn't sound normal to me, unless you've been up all night with the cramping and pain. Are you taking a narcotic pain medication? That would cause tiredness.