Add MIT license + citation to model card

README.md

@@ -1,4 +1,5 @@
 ---
+license: mit
 tags:
   - sleep
   - eeg
@@ -82,3 +83,22 @@ night takes ~1 minute).
 `hypnos_multimodal.safetensors` — weights under namespaced keys (`model/…`, `tok/<name>/…`)
 with the config as a JSON string in the file metadata. Loaded with `safetensors` (no
 arbitrary-code unpickling).
+
+## License
+
+Released under the [MIT License](LICENSE).
+
+## Citation
+
+```bibtex
+@online{carterNextTokenPredictionLearns2026,
+  title       = {Next-Token Prediction Learns Generalisable Representations of Sleep Physiology},
+  author      = {Carter, Jonathan F. and Tarassenko, Lionel},
+  date        = {2026-06-08},
+  eprint      = {2606.09605},
+  eprinttype  = {arXiv},
+  eprintclass = {cs.AI},
+  doi         = {10.48550/arXiv.2606.09605},
+  url         = {http://arxiv.org/abs/2606.09605},
+}
+```