The phrase "almost nocturnal" is correct and usable in written English.
It can be used to describe something that is not fully nocturnal but exhibits some behaviors or characteristics associated with nighttime activity.
Example: "The owl is almost nocturnal, often hunting at dusk and dawn rather than exclusively at night."
Alternatives: "partially nocturnal" or "semi-nocturnal".
The 75-year-old has become "almost nocturnal" since having the pen confiscated, after staff feared he could lash out at others in Ashworth mental hospital in Merseyside.
"He now leads an almost nocturnal existence, only coming out at night time when other patients are not present," said Eleanor Grey, QC, for Ashworth hospital, which does not believe Brady should be transferred to jail.
In some rooms the light is lowered to an almost nocturnal darkness in order to show how Rococo artists used reflective, shiny surfaces — gilded metal ornaments; gold-leafed, carved elements; mirrors; polished lacquer — not only as luxurious objects but also to make the most of candlelight.
However, the females of most nocturnal species, including almost all moth species, use pheromones to attract males, sometimes from long distances.
By contrast, in southern Europe and the tropics, the birds seem to be almost exclusively nocturnal, with the few birds that hunt by day being severely mobbed.
However, solitary foraging seems to characterize almost all nocturnal primates irrespective of their diet, suggesting that factors other than feeding competition may promote this type of social organization [Schülke, 2003].
Females normally lay one egg each day and progressively increase the amount of incubation from around 1 h at night after the first egg is laid to almost full nocturnal incubation by the end of laying (Haftorn and Reinertsen 1985).
Experiments with lima beans revealed that leaves damaged during the scotophase responded with an almost immediate nocturnal emission of (Z -3-hexenyl acetate, while the main emission of β-ocimene was delayed and peaked during the photophase (Arimura et al., 2008).
Something terrible has always just happened, or is about to, and the viewer bears the apprehensive weight of Allison's foreknowledge, having witnessed the violently detailed dreams that disrupt her sleep almost every other nocturnal hour.
In anurans, research on homing ability has focused almost exclusively on nocturnal species of the temperate regions, especially bufonids (Bogert 1947; Dole 1972; Sinsch 1987) (but see Gonser & Woolbright 1995; Nowakowski et al. 2012 for work on other groups).
In contrast to An. gambiae s.s. which is an almost entirely anthropophilic, nocturnal and endophagous feeder, An. arabiensis has been shown to exhibit much more variation for these traits (Lyimo and Ferguson 2009; Lyimo et al. 2013; White et al. 1972).
