It's not appropriate to sleep in it

• Not fitting
• Not appropriate to snooze with relations around
• Wrong for the situation
• Not at all appropriate
• Not on point
• Awkward getting some sleep in it
• Out of place
• Lacking skill

The Collaborative International Dictionary Word definitions in The Collaborative International Dictionary
Inapt \In*apt"\, a. [Pref. in- not + apt: cf. F. inapte. Cf. Inept .] Unapt; not apt; unsuitable; inept. -- In*apt"ly , adv. -- In*apt"ness , n.

Longman Dictionary of Contemporary English Word definitions in Longman Dictionary of Contemporary English
adjective EXAMPLES FROM CORPUS ▪ Both the barrister, and this court, accept with hindsight that his intervention was perhaps inapt or unfortunate. ▪ In this respect, the oft-quoted cathedral metaphor is not inapt . ▪ Yet it is not altogether inapt that ...