Inclusion Criteria:  For participants:  A resident within a care home or hospital ward setting operated by NHS Greater Glasgow and Clyde and/or Glasgow City HSCP, Inverclyde HSCP and/or Renfrewshire HSCP. Persons aged ≥ 65 years. First language must be English. A diagnosis of any form of dementia within the moderate to severe stages, defined as a score of at least '19' on the validated Dementia Severity Rating Scale. Present with SDB as confirmed by a Newcastle formulation constructed by a psychologist with multidisciplinary input. Having retained the relevant cognitive faculties required to engage with audio-video technologies, including attention, recognition and communication as confirmed by a Newcastle formulation constructed by a clinical psychologist with multidisciplinary input.  For informants, inclusion requires proficiency in the English language and having known the participant before and/or after the participants diagnosis of dementia, as well as having interacted with the participant in any capacity over the previous year.  For recorders, inclusion criteria involved proficiency in English language and ongoing contact/interaction with the participant for whom the recording is being made. This would be made clear through consultation with the care team and the Newcastle formulation that will have been made as part of routine practice.  Finally, regarding professionals, inclusion involves proficiency in English language and being employed by NHSGGC and having worked directly on a regular basis with the participant at point of recruitment (i.e. once over the previous 3-month period).  Exclusion Criteria:  For participants:  No relative/friend/caregiver available to be recorded. Significant vision and/or hearing impairments that cannot be corrected. Pre-existing neurological or severe psychiatric disorder (e.g. psychosis, bi-polar disorder). Diagnosed or suspected intellectual and developmental disability.  For informants, the main exclusion criteria include being unable to understand English.  For the recorders, exclusion criteria involve possible speech deficits or issues that may impact the quality of the recording and/or having a full face covering that prevents a recognition of a person on video. Additionally, if someone does not have a close relationship or has a contentious relationship with the participant, they would not be eligible to be recorded. This would be made clear through consultation with the care team and the Newcastle formulation that will have been made by the team as part of routine practice.  Finally, regarding professionals, the main exclusion criteria would be not having been familiarised with the SPT procedure.