the participants assigned to Group 1 will be given sleep hygiene education and instructed how to apply lavender oil inhalation. The participants will be provided with charts on sleep hygiene education and lavender oil inhalation and shown how to regularly keep daily records using their charts. The participants in this group will be given a copy of the sleep hygiene education brochure and lavender oil in a 10 ml bottle.

The participants assigned to Group 2 will only be given sleep hygiene education. They will be provided with a copy of the sleep hygiene education brochure and a chart on which to record their sleep hygiene practices.

The participants assigned to Group 3 will only be instructed on how to apply lavender oil inhalation and keep regular daily records on the chart given. The participants in this group will be given lavender oil in a 10 ml bottle.

Participants assigned to Group 4 will be given routine care and no application will be made.

Patient care and follow-up are routinely performed as follows: Following the patient's admission to the clinic, the first evaluation of the patient is made by the ostomy and wound care nurses within 24 hours, and patient education is initiated accompanied by the primary caregiver from the family. Throughout the period from admission to clinic to discharge, the ostomy care and education of the patient is repeated by the ostomy and wound care nurses every 72 hours. In addition, the patient and caregiver are given the contact information of the ostomy and wound care nurses and informed that they can call them at any time when they need it after discharge from the hospital.

Lavender oil inhalation;During the trial, the participants will be asked to practice lavender oil inhalation as follows: Every night before going to bed (21:00-24:00), the participants will drop two drops of 2% lavender essential oil on a 2x2 cm cotton gauze pad in a bowl, place it at a distance of 15-20 cm from their pillows, and breath normally for 20 minutes. The participants will be instructed to repeat this process by dripping lavender oil onto a new gauze pad every night for four weeks.

. It consists of seven subscales with a total of 19 items, of which 18 are included in scoring. Each item is evaluated over 0-3 points, and the sum of the seven subscale scores constitutes the total PSQI score. The total score that can be obtained from the scale ranges from 0 to 21, and a high total score indicates poor sleep quality. A total PSQI score of ≤5 indicates 'good sleep', and a score of >5 indicates 'poor sleep'.

The scale consists of 11 items, seven evaluating physical fatigue and four evaluating mental fatigue. There are four options for response to the items in the scale (less than usual, no more than usual, more than usual, and much more than usual). The overall fatigue score is obtained by summing the scores in the physical and mental fatigue subscales. The physical fatigue subscale score ranges from 0 to 21, the mental fatigue subscale score ranges from 0 to 12, and the total fatigue score ranges from 0 to 33. An increase in the scale score indicates an increase in the severity of fatigue.

The remaining items are grouped into three subscales: work/social life (six items), sexuality/body image (five items), and stoma function (six items). In addition, there is one item related to the economic situation and one item related to skin irritation, which do not fall into any of the previously mentioned subscales. Minimum and maximum scores for each subscale are 0 and 100, respectively, with high scores indicating an increase in quality of life. If two items in any subscale are left unanswered in the scale, the relevant subscale is not taken into consideration during scoring, but if one item is left unanswered, it can be included in evaluation.