midnight
I do n't know how many hours or days we wandered around there ! I slept twice from sheer exhaustion ; Tweel never seemed to need sleep . We tried following only the upward corridors , but they 'd run uphill a ways and then curve downwards . The temperature in that damned ant hill was constant ; you could n't tell night from day and after my first sleep I did n't know whether I 'd slept one hour or thirteen , so I could n't tell from my watch whether it was midnight or noon . `` We saw plenty of strange things . There were machines running in some of the corridors , but they did n't seem to be doing anything -- just wheels turning . And several times I saw two barrel-beasts with a little one growing between them , joined to both . ''