| BF | Basal forebrain |
| CNS | Central nervous system |
| DRN | Dorsal raphe nucleus |
| EEG | Electroencephalogram |
| GABA | γ-aminobutyric acid |
| GPCRs | G protein–coupled receptors |
| LC | Locus coeruleus |
| LDT | Laterodorsal tegmental nucleus |
| LH | Lateral hypothalamus |
| MCH | Melanin-concentrating hormone |
| NK-1R | Neurokinin type 1 |
| NPS | Neuropeptide S |
| NPY | Neuropeptide Y |
| NREM | Non-rapid eye movement |
| POA | Preoptic area |
| PNS | Peripheral nervous system |
| PPT | Pedunculopontine tegmental nucleus |
| REM | Rapid eye movement |
| SCN | Suprachiasmatic nucleus |
| SP | Substance P |
| TMN | Tuberomammillary nucleus |
| VIP | Vasoactive intestinal peptide |
| vlPAG | Ventrolateral periaqueductal gray |
| VLPO | Ventrolateral preoptic nucleus |