“…This is complemented by other studies, showing that at least components of CBT-I are feasible in complex inpatient settings with acceptance of the programme by patients (Biancosino et al, 2006;Haynes et al, 2011;Laguna-Parras et al, 2013;Sheaves et al, 2018;Tan et al, 1987). Moreover, the selected studies show that CBT-I was implemented using existing resources of the team on the ward (de Niet et al, 2010;Laguna-Parras et al, 2013;Morin et al, 1990) supporting behavioural therapy, are essential (Hossny et al, 2019;Novak et al, 2020;Paterson et al, 2021). For instance, it might compromise treatment effects when some team members centre on prolonged periods of wakefulness in the evening to increase sleep pressure and the responsible physician prescribes highly sedating drugs.…”