Patients with COPD or Lung Fibrosis following rehabilitation program will be invited to participate and answer the questionnaires in the beginning and after eight weeks of rehabilitation.

Patients with COPD or Lung Fibrosis who do not do any regular activity will be invited to participated and answer the questionnaires just once.

Patients with medical condition to follow the rehabilitation program will be asked to answer questionnaires to assess their sleep quality.

Sleep quality will be assessed by the questionnaire "Epworth Sleepiness Scale". A score between 0-5 indicates "lower normal daytime sleeping"; between 6-10 "higher normal daytime sleepiness; 11-12 "mil excessive daytime sleepiness"; 13-15 "moderate excessive daytime sleepiness" and 16-24 "severe excessive daytime sleepiness".

Sleep quality will be assessed by the questionnaire "Insomnia Severity Index ". A scale is used to rank each item, where "0" means "no problem", "1 - mild problem", "2 - moderate" "3 - severe" and "4 very severe problem". The total score is interpreted as absence of insomnia (0-7); sub-threshold insomnia (8-14); Moderate insomnia (15-21); and severe insomnia (22-28).

Sleep quality will be assessed by the questionnaire "Morningness - Eveningness Questionnaire ". Scores between 42 and 58 indicate "neural types", scores of 59 and above indicate "morning types" and scores of 41 and below indicates "evening types".

Sleep quality will be assessed by the questionnaire "Sleep Agenda". The sleep agenda is a subjective method of sleep evaluation which demand the patient to fill the agenda at two times of the day: at 9 in the morning to describe what happened at night and 9 in the evening to report what happened in the day for a minimum of three weeks. The patient need to specify the quality of his night, if it was "very good", "good", "average", "bad" and "very bad" and specify, also, if he took any medications or if something happened may have interfered with his sleep.

Nijmegen Questionnaire is a valid questionnaire to detect patients who have hyperventilation symptoms which the complaints may not be fully due to physiological abnormality, that is, it reflects a subjective aspect of dysfunctional breathing reflecting anxiety symptoms. Scores > 23 is indicative of dysfunctional breathing.