AbstractSeclusion in psychiatric hospital care refers to isolating a service user from other service users and staff, most often in a locked and unfurnished room. Service users' experiences of seclusion are mostly negative, and although some have seen a rationale for its use, mental health nurses should be encouraged to evaluate current seclusion practices from the service user's perspective. In this small-scale experiment, two mental health nurses were voluntarily secluded for 24h. The aim was to explore the experience of being secluded, to understand and evaluate the impact of seclusion in greater detail, and to encourage discussion on one of the controversies in mental health nursing. To the best of our knowledge, this is the first attempt to evaluate the impact of seclusion based on mental health nurses' firsthand experiences. The nurses received usual seclusion treatment and described their experiences of this every 6h. Based on the nurses' experiences, seclusion, even in voluntary, safe and planned circumstances, may increase anxiety and frustration. Seclusion was viewed negatively and the physical environment was considered inhumane. The nurses offered some practical suggestions for updating seclusion practices and re-designing seclusion facilities. Mental health nurses, who frequently decide on and invariably implement seclusion, are key to improving seclusion practices.