i sowed seeds form teh neopolitan cyclamen.. i kept balls of seeds until dry and had burst in a paper bag.. i then sowed them in compost and left under a bush for shelter and kept them moist.. i now have 35 small ones.
i always think when sowing seeds that the best time is when the plant itself has finished its flowering and seeded itself.. as that is when they naturally seed.
gardeningfantic is right. The plant knows when to sow seed. When it is ripe and is shed naturally.
Cyclament seed is best sown fresh for good results. Even the persicum types do better that way. They also do better if soaked in warm slightly soapy water. This removes the sugary coating from the seed, usually licked off by ants in the wild. Sow in ordinary compost and cover lightly with grit or Vermiculite. Keep at about 16c. and in the light and they usually germinate very quickly. Do not prick out the tiny corms too soon, let them get to about 1 cm. across before disturbing.
Seeds are ready when the pod goes papery and begins to split open. Be quick on outdoor ones, as the ants will soon have them.
So, what do I do? I collect the C. hederifolium and C. coum seeds when they are ripe and sprinkle them on the gravel garden and leave them to it. Much the easiest way.
If you have dried seeds, then definitely soak overnight in warm water or they will never germinate. (Soak the seeds not yourself, unless you need to).