He started working at night and sleeping during the moring/early afternoon while he was at university.
He was the type of guy that was so good that he didn't really have to follow the university rules very much. He would get into trouble for not following some stupid requirement, but he was so good that they would just let him get away with it.
However, QED and the men who made it: Dyson, Feynman, Schwinger, and Tomonaga by Silvan Schweber (1994) does emphacise that he was actually also very practical in the sense that he always aimed to obtain definite numbers out of his calculations, and that was not only the case for the Lamb shift.
- Advanced quantum mechanics by Freeman Dyson (1951) | 123
- Anomalous magnetic dipole moment of the electron | 134, 163, 1
- Ciro Santilli's Wikipedia contributions | 37
- Freeman Dyson | 250, 299, 2
- Lamb shift | 516, 817, 1
- Pocono conference | 87
- Richard Feynman | 554, 2k, 13
- Selected Papers on Quantum Electrodynamics by Julian Schwinger (1958) | 35