1Q84 Book 1: April - June by Haruki Murakami

The phone woke Tengo. The luminous hands of his clock pointed to a little after one a.m. The room was dark, of course. Tengo knew the call was from Komatsu. No one but Komatsu would call him at one in the morning-and keep the phone ringing until he picked it up, however long it took. Komatsu had no sense of time. He would place a call the moment a thought struck him, never considering the hour. It could be the middle of the night or the crack of dawn. The other person could be enjoying his wedding night or lying on his deathbed. The prosaic thought never seemed to enter Komatsu's egg-shaped head that a call from him might be disturbing.

Which is not to say that he did this with everyone. Even Komatsu worked for an organization and collected a salary. He couldn't possibly go around behaving toward everyone with a total disregard for common sense. Only with Tengo could he get away with it. Tengo was, for Komatsu, little more than an extension of Komatsu himself, another arm or leg. If Komatsu was up, Tengo must be up. Tengo normally went to bed at ten o'clock and woke at six, maintaining a generally regular lifestyle. He was a deep sleeper. Once something woke him, though, it was hard for him to get to sleep again. He was high-strung to that extent. He had tried to explain this to Komatsu any number of times, and pleaded with him not to call in the middle of the night, like a farmer begging God not to send swarms of locusts into his fields before harvest time.