Whilst working late my attention was brought to a very bright light to the north west of felindre, pembrokeshire in west wales. i approached the window and become aware the object was moving, bobbing in the air and at occasions moving from left to right etc. my son was up late watching tele, he came to observe the object through the window, we both decided to venture outside and stood to the front of our home. my son pointed out that the sheep in a field away in the direction of the object were making lots of noise. we watched the object which occasionally descended 10 to 20 feet but return to it's original altitude but it was far too cold to stay outdoors and so we returned to the house. from my office window the object remained visible, as i continued my work i'd now and then look to the window to see if the object remained but by 12:30 the object had completely gone. this was a very clear moon lit night and throughout the whole event there were no clouds.