I did not feel well all night.
'Sentivo' — sen-TI-vo. The imperfect tense marker 'ivo'; stress on the second syllable.
Say this to hotel staff in the morning when you have been ill during the night and need medical assistance or want to explain why you could not check out on time.
'Non mi sentivo bene' uses the imperfect tense (imperfetto) of 'sentirsi' — 'sentivo' — expressing a continuous state in the past. The imperfect is used for past conditions, feelings, and ongoing situations, unlike the passato prossimo which expresses completed events.
Ho avuto la febbre stanotte.
I had a fever last night.
Specific symptom using passato prossimo (completed event).
Ho bisogno di riposare ancora.
I need to rest more.
Request for extra time in the room.
Posso avere una tisana?
Can I have a herbal tea?
A gentle restorative request.
Italian hotel staff are trained to assist with medical situations and can call a 'guardia medica' (on-duty doctor) who makes home visits. This service is part of the national health system. For serious symptoms, the pronto soccorso (emergency room) is always available.