Late Night Jazz

Stacey Kent - Raconti-Moi; The Changing Lights
Karrin Allyson - Ballads: Remembering John Coltrane
Dorothy Ashby - In A Minor Groove
Anouar Brahem - Le Pas Du Chat Noir
Alice Coltrane - Journey in Satchidananda
Gal Costa - Live at the Blue Note
Bill Evans - Undercurrent
Melody Gardot - Worrisome Heart
Tord Gustavson - Being There
Keith Jarrett & Charlie Haden - Last Dance
Etta Jones - Lonely and Blue

Iggy And The Stooges - Raw Power (jk! seeing if you were paying attention)

Sonny Stitt, anything he plays .

Mark Murphy - Once To Every Heart
Madeleine Peyroux - Half the Perfect World
Tierney Sutton - Blue in Green
Emilie-Claire Barlow - Seule Ce Soir

Shirley Horn
Antonio Carlo Jobim
+1 Chet Baker w/Bill Evans
Keith Jarrett w/ Charlie Haden
Miles Davis - Kind of Blue

At late night, when I listen to jazz, I most often listen to piano, either solo or with one other instrument. In addition to some of the albums listed in previous responses, here are long-time favorites and some that I've been enjoying recently:

Ahmad Jamal -- Ballades
Fred Hersch -- Music from Home
Bill Evans -- Sunday at the Village Vanguard and Waltz for Debby
Charlie Haden and Hank Jones -- Steal Away and Come Sunday
Charlie Haden and Chet Baker -- Silence

And some exceptions to the rule include:

Ben Webster -- Soulville (yep, I'll join the chorus on this one)
Ben Webster -- Jazz 'Round Midnight
Pat Metheny and Brad Mehldau -- Across the Wide Missouri Sky
Joe Pass -- Meditation and Unforgettable

Happy listening and sweet dreams!

Jim