We had 3 cocatiels...they were ok but would bite every now and again. We gave them to our birdie friends of ours when we moved out here to the ranch. I didn't want the mess. I swear I cleaned up more seed than they ate! Don't even get me started on how they woke us up EVERY MORNING!
And to answer the question...does a blanket make them sleep...NO!
I actually enjoyed having them most of the time...I just don't miss them much.