Moments to watch
The faithful usually stand for the Gospel, the Creed, important litanies, blessings, and the most solemn Eucharistic moments. Sitting is more common during long readings, the homily, announcements, or pauses in the service, depending on local practice.
Come to Me, all you who labor and are heavy laden, and I will give you rest.
Long Coptic services can include Matins, readings, incense, litanies, Eucharistic prayer, and Communion. Sitting at appropriate moments can help the faithful remain attentive through the whole service instead of growing distracted by exhaustion.
Sitting with attention
The Church calls the whole person to worship, including the body. Standing, sitting, bowing, and crossing oneself all teach attention. Sit quietly and without embarrassment when needed; the point is prayerful presence, not pretending your body has no limits.
The most reverent choice is the one that helps you pray honestly. If the parish stands and your body can stand, stand with them. If your body needs rest, sit with humility and keep your attention on the prayer.
This balance keeps reverence from becoming either carelessness or anxiety.