[…] falling or staying asleep; • Hypervigilance; • Exaggerated startle response; • Difficulty with concentration or attention; • Restricted range of affect.
[medscape.com]
It illustrates difficulties clinicians face in discriminating between the effects of developmental delay, traumatic brain injury, attention-deficit/hyperactivity disorder,
[ncbi.nlm.nih.gov]
Symptoms of PTSD include intrusive thoughts, flashbacks, nightmares, extreme distress when reminded of the trauma, sleep disturbances, difficulty concentrating, hyper-alertness
[med.upenn.edu]