I think I'd simply say: "tired but happy" or (more extreme) "utterly exhausted but deeply satisfied/content".
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AnnvanI think I'd simply say: "tired but happy" or (more extreme) "utterly exhausted but deeply satisfied/content".Thanks. It's just that I feel tha if you're so tired, happiness (or even satisfaction) suggests alertness. I know what I want to say but can't get the word out of its filing cabinet somewhere inside my brain!
Langurous is a good one. "characterized by tiredness or inactivity, especially of a pleasurable kind."