groggy
adjective /ˈɡrɒɡi/
  /ˈɡrɑːɡi/
 [not usually before noun] (comparative groggier, superlative groggiest)
 (informal)- weak and unable to think or move well because you are ill or very tired- The sleeping pills left her feeling very groggy.
- He’s still groggy from the anaesthetic.