The speaker addresses "night rose," which could be a flower, a rose-colored dusk, or something more personal, and asks it to let him go to bed and tie his hands. The request is odd and a little unsettling. Tying your own hands is an act of restraint, yet he frames it as something he wants, which fits the title's "masochist."
The second stanza turns on a small, defiant boast: he might be old, but he could endure. The word "but" suggests he's pushing back against the idea that age has softened him. Whether the endurance is about pain, longing, or sleeplessness, the poem leaves open. Judging by the imagery, the binding could mean surrender to rest, or a willing submission to desire he can no longer act on freely.
The mood is quiet, wry, and slightly vulnerable. There's humor in the blunt title, but also a thread of tenderness and stubborn pride beneath it.