A total 140 term babies with hypoxic ischaemic encephalopathy will be recruited. The investigators will collect continuous electrocardiography (ECG) data, hourly Neonatal Pain Agitation and Sedation Scale (NPASS) and 12 hourly salivary cortisol, for the first five days after birth. Various clinical interventions, and noise and light levels that the baby is exposed to, for the first 5 days after birth will be be recorded.