Lie still, lie still where green light filters down

Lie still, lie still where green light filters down
Through grass and crumbling clay :
Lenten is come with love to town ,
Now springs the spray .
Last year when cherry trees were gay
You danced your fill :
They dance above your grave today :
Lie still.

Sleep long , sleep long , where soft rain filters down
Through sodden grass and clay :
Lenten is come with love to town ,
Now springs the spray .
Last year when waking birds were gay
You loved their song :
They sing above your grave today :
Sleep long.

Dream deep , dream deep , where south winds whisper down
Through grass and crumbling clay :
Lenten is come with love to town ,
Now springs the spray .
Last year when love was new and gay
I watched your sleep :
I watch beside your grave today :
Dream deep.

Undated; but the paper as well as the writing matches the sestina to Sidney.