Aside from standard baby monitors which provide audio (and less frequently video) monitoring there are various advanced alarm systems available including personal alarms and bed seizure alarms. Bed seizure alarms use a sensor under the child’s mattress to detect a tonic-clonic seizure and may be wirelessly connected to a ‘parent’ unit.
The Emfit system from Finland has received positive reviews and has recently performed well in a university hospital study. The study found that the system detected 85% of generalized tonic-clonic seizures that occurred in sleeping children. There is no minimum weight limit and the bed sensor is only 58cm (L) x 40cm (W) so it should fit most cots (and larger beds).