diurnal is to day as "..." is to morning [closed]
matutinal adjective [formal]
happening in the morning:
- We chatted over our matutinal coffee.
[Cambridge Dictionary]
Though normal people have morning coffee.
I think I would use matinal, which the OED holds to have the same meaning as matutinal. However the latter they designate as now chiefly literary.
The examples they provide, for matinal across three main senses, are as follows:
- = matutinal adj. 1.
1803 M. Charlton Wife & Mistress (ed. 2) II. i. 11 To attend the matinal déjeuné's of old Gruffy in town.
1860 Ld. Lytton Lucile ii. v. §9. 30 The matinal chirp of a bird.
1862 Mrs. H. Wood Channings II. 74 Believing it could be nobody less than the bishop come to alarm them with a matinal visit.
1908 J. Davidson Testament 37 The earth with its seas and its skies, Its flowers and its matinal dew.
1991 E. S. Connell Alchymist's Jrnl. (1992) 100 Wounds contracted past noon are less auspicious than matinal injuries.
- a. = matutinal adj. 2.
1819 H. Busk Vestriad v. 276 The grey-ey'd Hours climb up the starry way To meet fair maidens matinal as they.
1842 F. Trollope Visit to Italy I. xiv. 219 As if my very matinal son and myself had constituted the whole party. 1997 Church Times 11 Apr. 20/3 I am, metabolically speaking, one of Bishop Heber's sons of the morning: a matinal man who is fast asleep before the epilogue. b. Entomology. Of, relating to, or designating insects that are only active in the early morning.
1970 Jrnl. Kansas Entomol. Soc. 43 251 (title) Some competitive relationships among matinal and late afternoon foraging activities of caupolicanine bees.
1985 Biotropica 17 217 Visitors that remove nectar, but are ineffective pollinators include seven Euglossa spp. and three species of matinal butterflies (Hesperiidae).
1997 Jrnl. Thermal Biol. 22 453 Activity patterns are..either matinal, crepuscular, or bimodal; essentially desert bees avoid heat and adapt to cold desert dawns and dusks.
Why not use "matin", as in "matins" (morning devotions)? I would even use "matinal", though it might not be in every dictionary. "My usual matinal activities always include breakfast and prayers."
If you're willing to be obscure, "auroral" can mean "of or pertaining to the dawn" (from the Roman goddess of the dawn), though this usage is swamped by the atmospheric phenomenon. The variant "aurorean" is more restricted to the dawn meaning, but is also even more obscure.
(The Cambridge dictionary doesn't have the dawn meaning nor "aurorean"; Merriam-Webster does.)