Time of day

The Westlands, at least in the White Tower, have names for certain hours during the day. Chronologically, they fall in this order. 
* First Rise: Very early, before dawn. Gitara Moroso has her fatal Foretelling at this hour.
* Second Rise: Likely midway between First and Second Rise. Seems a reasonable time to get up.
* Third Rise: Elaida's clock, commissioned by Cemaile Sorenthaine, chimes Third Rise as she contemplates the construction of her palace. The builders had already begun work at this time.
* High: Not, as it might sound, noon, but "midmorning". This is "before dinner".
* Midmorning: In the Companion entry on time units, this is also capitalized in reference to bells being rung, but isn't listed as an hour in itself. Mat refers to Midmorning just before he bests Galad and Gawyn with his quarterstaff.
* midday/noon: Same as real life.
* Prime: Afternoon. Given the name, it's either 1pm or the first named "hour" (see notes). Nynaeve says that if they didn't hear from the Amyrlin by midday, she wanted to be away by Prime.
* Trine: Novices' normal training hours finish at this time.
* Full: Occurs after supper. Novices sometimes had extra lessons between supper and Full, but this was usually their period for doing chores.
* Last: All novices are supposed to be quiet and in bed by this time. Egwene calls a meeting of the Hall of the Tower in Tel'aran'rhiod in the chapter "When Last Sounds". "Last" implies the last hour of the day, so perhaps 11pm. That it is almost the next day is implied in the mentioned chapter.
* midnight: Same as real life.
* First Low: Not explictly mentioned, but seems likely to exist by implication of Second Low.
* Second Low: Occurs "in the small hours of the morning". Alviarin wakes Elaida at this hour to report Covarla Baldene's return from Dumai's Wells.
With the exception of midday/noon and midnight, the names of the hours are capitalized. Except where noted otherwise, all the information above is from The Wheel of Time Companion.
Second Even is mentioned as when supper can be eaten in Cairhien. First Even is never mentioned. 
==Further comments==
There are twenty-four hours in the day. This is split into two periods of twelve hours as in the real world. In New Spring, Moiraine notes that Kerene Nagashi's clock had "hands frozen at just before noon, or midnight", indicating that they are indistinguishable on a clock. Note also that Moiraine does not give these special names, implying that they are named hours distinct from others in the list.
There is a typo in the Companion concerning the hours novices have lessons. It says that their second session is "from supper to Trine", when it should read "dinner". This would also contradict Trine being in the afternoon.
The name Trine could have its origins in astrology or an association with the number three.
The clocks appear to chime a diffent number than we might expect. Quoting directly: 
* "The jeweled cylinder-clock on the wave-carved marble mantel chimed four times for the second hour of the morning." 
* "The clock chimed twice, and then the only sounds were the drumming of the rain and therush of the wind. Workmen who had been braving the weather would be downing tools to trudge home.... The clock sounded the first full hour of the night...four chimes for the second." 
* The huge gilded case clock against the wall, a vulgarly over-ornamented piece, chimed twice for High.
* The gilded pendulum clock on the scroll-carved marble mantel chimed three times. Perhaps as many hours remained till sunrise. 
* The ball-clock chimed three times for the hour.
Since we never hear a clock chime more than four times, it seems likely that they chime in cycles. The period of repetition is unknown.