| DLMO | Dim light melatonin onset |
| CAR | Cortisol awakening response |
| LC–MS/MS | Liquid chromatography–tandem mass spectrometry |
| MRM | Multiple reaction monitoring |
| LOQ | Limit of quantification |
| SCN | The suprachiasmatic nucleus |
| RIA | Radioimmunoassay |
| PPT | Protein precipitation |
| LLE | Liquid–liquid extraction |
| SPE | Solid-phase extraction |
| GC–MS | Gas chromatography–mass spectrometry |
| ASD | Autism spectrum disorder |
| ADHD | Attention-deficit/hyperactivity disorder |
| WASO | Wake after sleep onset |
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