suru verb (special), intransitive verb
Literary or formal verb for closing one's eyes, often with a nuance of quiet repose or entering sleep. Rare in modern conversation; 目を閉じる or 眠る are the usual expressions.
彼は静かに瞑して、深い眠りについた。
He quietly closed his eyes and fell into a deep sleep.
suru verb (special), intransitive verb
Euphemistic or poetic use for dying peacefully; often appears in epitaphs or solemn contexts. Very rare.
ここに永遠に瞑する。
Here rests in peace forever.