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Frequency distribution of the tools included in our systematic review (n=41).
| Digital tools | Number of articles, n (%) |
| Smartwatch | 4 (10) |
| Smart pillow | 1 (2) |
| Smartphone | 7 (17) |
| Ring | 1 (2) |
| Respiration belt | 1 (2) |
| Radar | 5 (12) |
| Neck device | 1 (2) |
| Nasal air flow | 5 (12) |
| Microphones | 2 (5) |
| Mattress sensor | 10 (24) |
| Garment | 1 (2) |
| Bone conducted vibration | 1 (2) |
| Adhesive patch | 2 (5) |
